<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2013 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.7.9, 2013-06-02
 */


/**
 * PHPExcel_Writer_Excel2007_Theme
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel2007_Theme extends PHPExcel_Writer_Excel2007_WriterPart {
	/**
	 * Map of Major fonts to write
	 *
	 * @static    array of string
	 *
	 */
	private static $_majorFonts = array(
			'Jpan' => 'ＭＳ Ｐゴシック',
			'Hang' => '맑은 고딕',
			'Hans' => '宋体',
			'Hant' => '新細明體',
			'Arab' => 'Times New Roman',
			'Hebr' => 'Times New Roman',
			'Thai' => 'Tahoma',
			'Ethi' => 'Nyala',
			'Beng' => 'Vrinda',
			'Gujr' => 'Shruti',
			'Khmr' => 'MoolBoran',
			'Knda' => 'Tunga',
			'Guru' => 'Raavi',
			'Cans' => 'Euphemia',
			'Cher' => 'Plantagenet Cherokee',
			'Yiii' => 'Microsoft Yi Baiti',
			'Tibt' => 'Microsoft Himalaya',
			'Thaa' => 'MV Boli',
			'Deva' => 'Mangal',
			'Telu' => 'Gautami',
			'Taml' => 'Latha',
			'Syrc' => 'Estrangelo Edessa',
			'Orya' => 'Kalinga',
			'Mlym' => 'Kartika',
			'Laoo' => 'DokChampa',
			'Sinh' => 'Iskoola Pota',
			'Mong' => 'Mongolian Baiti',
			'Viet' => 'Times New Roman',
			'Uigh' => 'Microsoft Uighur',
			'Geor' => 'Sylfaen',
	);

	/**
	 * Map of Minor fonts to write
	 *
	 * @static    array of string
	 *
	 */
	private static $_minorFonts = array(
			'Jpan' => 'ＭＳ Ｐゴシック',
			'Hang' => '맑은 고딕',
			'Hans' => '宋体',
			'Hant' => '新細明體',
			'Arab' => 'Arial',
			'Hebr' => 'Arial',
			'Thai' => 'Tahoma',
			'Ethi' => 'Nyala',
			'Beng' => 'Vrinda',
			'Gujr' => 'Shruti',
			'Khmr' => 'DaunPenh',
			'Knda' => 'Tunga',
			'Guru' => 'Raavi',
			'Cans' => 'Euphemia',
			'Cher' => 'Plantagenet Cherokee',
			'Yiii' => 'Microsoft Yi Baiti',
			'Tibt' => 'Microsoft Himalaya',
			'Thaa' => 'MV Boli',
			'Deva' => 'Mangal',
			'Telu' => 'Gautami',
			'Taml' => 'Latha',
			'Syrc' => 'Estrangelo Edessa',
			'Orya' => 'Kalinga',
			'Mlym' => 'Kartika',
			'Laoo' => 'DokChampa',
			'Sinh' => 'Iskoola Pota',
			'Mong' => 'Mongolian Baiti',
			'Viet' => 'Arial',
			'Uigh' => 'Microsoft Uighur',
			'Geor' => 'Sylfaen',
	);

	/**
	 * Map of core colours
	 *
	 * @static    array of string
	 *
	 */
	private static $_colourScheme = array(
			'dk2' => '1F497D',
			'lt2' => 'EEECE1',
			'accent1' => '4F81BD',
			'accent2' => 'C0504D',
			'accent3' => '9BBB59',
			'accent4' => '8064A2',
			'accent5' => '4BACC6',
			'accent6' => 'F79646',
			'hlink' => '0000FF',
			'folHlink' => '800080',
	);

	/**
	 * Write theme to XML format
	 *
	 * @param    PHPExcel $pPHPExcel
	 *
	 * @return    string        XML Output
	 * @throws    PHPExcel_Writer_Exception
	 */
	public function writeTheme(PHPExcel $pPHPExcel = null) {
		// Create XML writer
		$objWriter = null;
		if ($this->getParentWriter()->getUseDiskCaching())
		{
			$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
		}
		else
		{
			$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
		}

		// XML header
		$objWriter->startDocument('1.0', 'UTF-8', 'yes');

		// a:theme
		$objWriter->startElement('a:theme');
		$objWriter->writeAttribute('xmlns:a', 'http://schemas.openxmlformats.org/drawingml/2006/main');
		$objWriter->writeAttribute('name', 'Office Theme');

		// a:themeElements
		$objWriter->startElement('a:themeElements');

		// a:clrScheme
		$objWriter->startElement('a:clrScheme');
		$objWriter->writeAttribute('name', 'Office');

		// a:dk1
		$objWriter->startElement('a:dk1');

		// a:sysClr
		$objWriter->startElement('a:sysClr');
		$objWriter->writeAttribute('val', 'windowText');
		$objWriter->writeAttribute('lastClr', '000000');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:lt1
		$objWriter->startElement('a:lt1');

		// a:sysClr
		$objWriter->startElement('a:sysClr');
		$objWriter->writeAttribute('val', 'window');
		$objWriter->writeAttribute('lastClr', 'FFFFFF');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:dk2
		$this->_writeColourScheme($objWriter);

		$objWriter->endElement();

		// a:fontScheme
		$objWriter->startElement('a:fontScheme');
		$objWriter->writeAttribute('name', 'Office');

		// a:majorFont
		$objWriter->startElement('a:majorFont');
		$this->_writeFonts($objWriter, 'Cambria', self::$_majorFonts);
		$objWriter->endElement();

		// a:minorFont
		$objWriter->startElement('a:minorFont');
		$this->_writeFonts($objWriter, 'Calibri', self::$_minorFonts);
		$objWriter->endElement();

		$objWriter->endElement();

		// a:fmtScheme
		$objWriter->startElement('a:fmtScheme');
		$objWriter->writeAttribute('name', 'Office');

		// a:fillStyleLst
		$objWriter->startElement('a:fillStyleLst');

		// a:solidFill
		$objWriter->startElement('a:solidFill');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:gradFill
		$objWriter->startElement('a:gradFill');
		$objWriter->writeAttribute('rotWithShape', '1');

		// a:gsLst
		$objWriter->startElement('a:gsLst');

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '0');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:tint
		$objWriter->startElement('a:tint');
		$objWriter->writeAttribute('val', '50000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '300000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '35000');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:tint
		$objWriter->startElement('a:tint');
		$objWriter->writeAttribute('val', '37000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '300000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '100000');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:tint
		$objWriter->startElement('a:tint');
		$objWriter->writeAttribute('val', '15000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '350000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:lin
		$objWriter->startElement('a:lin');
		$objWriter->writeAttribute('ang', '16200000');
		$objWriter->writeAttribute('scaled', '1');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:gradFill
		$objWriter->startElement('a:gradFill');
		$objWriter->writeAttribute('rotWithShape', '1');

		// a:gsLst
		$objWriter->startElement('a:gsLst');

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '0');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:shade
		$objWriter->startElement('a:shade');
		$objWriter->writeAttribute('val', '51000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '130000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '80000');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:shade
		$objWriter->startElement('a:shade');
		$objWriter->writeAttribute('val', '93000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '130000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '100000');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:shade
		$objWriter->startElement('a:shade');
		$objWriter->writeAttribute('val', '94000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '135000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:lin
		$objWriter->startElement('a:lin');
		$objWriter->writeAttribute('ang', '16200000');
		$objWriter->writeAttribute('scaled', '0');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:lnStyleLst
		$objWriter->startElement('a:lnStyleLst');

		// a:ln
		$objWriter->startElement('a:ln');
		$objWriter->writeAttribute('w', '9525');
		$objWriter->writeAttribute('cap', 'flat');
		$objWriter->writeAttribute('cmpd', 'sng');
		$objWriter->writeAttribute('algn', 'ctr');

		// a:solidFill
		$objWriter->startElement('a:solidFill');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:shade
		$objWriter->startElement('a:shade');
		$objWriter->writeAttribute('val', '95000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '105000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:prstDash
		$objWriter->startElement('a:prstDash');
		$objWriter->writeAttribute('val', 'solid');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:ln
		$objWriter->startElement('a:ln');
		$objWriter->writeAttribute('w', '25400');
		$objWriter->writeAttribute('cap', 'flat');
		$objWriter->writeAttribute('cmpd', 'sng');
		$objWriter->writeAttribute('algn', 'ctr');

		// a:solidFill
		$objWriter->startElement('a:solidFill');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:prstDash
		$objWriter->startElement('a:prstDash');
		$objWriter->writeAttribute('val', 'solid');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:ln
		$objWriter->startElement('a:ln');
		$objWriter->writeAttribute('w', '38100');
		$objWriter->writeAttribute('cap', 'flat');
		$objWriter->writeAttribute('cmpd', 'sng');
		$objWriter->writeAttribute('algn', 'ctr');

		// a:solidFill
		$objWriter->startElement('a:solidFill');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:prstDash
		$objWriter->startElement('a:prstDash');
		$objWriter->writeAttribute('val', 'solid');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();


		// a:effectStyleLst
		$objWriter->startElement('a:effectStyleLst');

		// a:effectStyle
		$objWriter->startElement('a:effectStyle');

		// a:effectLst
		$objWriter->startElement('a:effectLst');

		// a:outerShdw
		$objWriter->startElement('a:outerShdw');
		$objWriter->writeAttribute('blurRad', '40000');
		$objWriter->writeAttribute('dist', '20000');
		$objWriter->writeAttribute('dir', '5400000');
		$objWriter->writeAttribute('rotWithShape', '0');

		// a:srgbClr
		$objWriter->startElement('a:srgbClr');
		$objWriter->writeAttribute('val', '000000');

		// a:alpha
		$objWriter->startElement('a:alpha');
		$objWriter->writeAttribute('val', '38000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:effectStyle
		$objWriter->startElement('a:effectStyle');

		// a:effectLst
		$objWriter->startElement('a:effectLst');

		// a:outerShdw
		$objWriter->startElement('a:outerShdw');
		$objWriter->writeAttribute('blurRad', '40000');
		$objWriter->writeAttribute('dist', '23000');
		$objWriter->writeAttribute('dir', '5400000');
		$objWriter->writeAttribute('rotWithShape', '0');

		// a:srgbClr
		$objWriter->startElement('a:srgbClr');
		$objWriter->writeAttribute('val', '000000');

		// a:alpha
		$objWriter->startElement('a:alpha');
		$objWriter->writeAttribute('val', '35000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:effectStyle
		$objWriter->startElement('a:effectStyle');

		// a:effectLst
		$objWriter->startElement('a:effectLst');

		// a:outerShdw
		$objWriter->startElement('a:outerShdw');
		$objWriter->writeAttribute('blurRad', '40000');
		$objWriter->writeAttribute('dist', '23000');
		$objWriter->writeAttribute('dir', '5400000');
		$objWriter->writeAttribute('rotWithShape', '0');

		// a:srgbClr
		$objWriter->startElement('a:srgbClr');
		$objWriter->writeAttribute('val', '000000');

		// a:alpha
		$objWriter->startElement('a:alpha');
		$objWriter->writeAttribute('val', '35000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:scene3d
		$objWriter->startElement('a:scene3d');

		// a:camera
		$objWriter->startElement('a:camera');
		$objWriter->writeAttribute('prst', 'orthographicFront');

		// a:rot
		$objWriter->startElement('a:rot');
		$objWriter->writeAttribute('lat', '0');
		$objWriter->writeAttribute('lon', '0');
		$objWriter->writeAttribute('rev', '0');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:lightRig
		$objWriter->startElement('a:lightRig');
		$objWriter->writeAttribute('rig', 'threePt');
		$objWriter->writeAttribute('dir', 't');

		// a:rot
		$objWriter->startElement('a:rot');
		$objWriter->writeAttribute('lat', '0');
		$objWriter->writeAttribute('lon', '0');
		$objWriter->writeAttribute('rev', '1200000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:sp3d
		$objWriter->startElement('a:sp3d');

		// a:bevelT
		$objWriter->startElement('a:bevelT');
		$objWriter->writeAttribute('w', '63500');
		$objWriter->writeAttribute('h', '25400');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:bgFillStyleLst
		$objWriter->startElement('a:bgFillStyleLst');

		// a:solidFill
		$objWriter->startElement('a:solidFill');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');
		$objWriter->endElement();

		$objWriter->endElement();

		// a:gradFill
		$objWriter->startElement('a:gradFill');
		$objWriter->writeAttribute('rotWithShape', '1');

		// a:gsLst
		$objWriter->startElement('a:gsLst');

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '0');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:tint
		$objWriter->startElement('a:tint');
		$objWriter->writeAttribute('val', '40000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '350000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '40000');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:tint
		$objWriter->startElement('a:tint');
		$objWriter->writeAttribute('val', '45000');
		$objWriter->endElement();

		// a:shade
		$objWriter->startElement('a:shade');
		$objWriter->writeAttribute('val', '99000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '350000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '100000');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:shade
		$objWriter->startElement('a:shade');
		$objWriter->writeAttribute('val', '20000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '255000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:path
		$objWriter->startElement('a:path');
		$objWriter->writeAttribute('path', 'circle');

		// a:fillToRect
		$objWriter->startElement('a:fillToRect');
		$objWriter->writeAttribute('l', '50000');
		$objWriter->writeAttribute('t', '-80000');
		$objWriter->writeAttribute('r', '50000');
		$objWriter->writeAttribute('b', '180000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gradFill
		$objWriter->startElement('a:gradFill');
		$objWriter->writeAttribute('rotWithShape', '1');

		// a:gsLst
		$objWriter->startElement('a:gsLst');

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '0');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:tint
		$objWriter->startElement('a:tint');
		$objWriter->writeAttribute('val', '80000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '300000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:gs
		$objWriter->startElement('a:gs');
		$objWriter->writeAttribute('pos', '100000');

		// a:schemeClr
		$objWriter->startElement('a:schemeClr');
		$objWriter->writeAttribute('val', 'phClr');

		// a:shade
		$objWriter->startElement('a:shade');
		$objWriter->writeAttribute('val', '30000');
		$objWriter->endElement();

		// a:satMod
		$objWriter->startElement('a:satMod');
		$objWriter->writeAttribute('val', '200000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:path
		$objWriter->startElement('a:path');
		$objWriter->writeAttribute('path', 'circle');

		// a:fillToRect
		$objWriter->startElement('a:fillToRect');
		$objWriter->writeAttribute('l', '50000');
		$objWriter->writeAttribute('t', '50000');
		$objWriter->writeAttribute('r', '50000');
		$objWriter->writeAttribute('b', '50000');
		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		$objWriter->endElement();

		// a:objectDefaults
		$objWriter->writeElement('a:objectDefaults', null);

		// a:extraClrSchemeLst
		$objWriter->writeElement('a:extraClrSchemeLst', null);

		$objWriter->endElement();

		// Return
		return $objWriter->getData();
	}

	/**
	 * Write fonts to XML format
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter
	 * @param    string                    $latinFont
	 * @param                              array of string                $fontSet
	 *
	 * @return    string                        XML Output
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeFonts($objWriter, $latinFont, $fontSet) {
		// a:latin
		$objWriter->startElement('a:latin');
		$objWriter->writeAttribute('typeface', $latinFont);
		$objWriter->endElement();

		// a:ea
		$objWriter->startElement('a:ea');
		$objWriter->writeAttribute('typeface', '');
		$objWriter->endElement();

		// a:cs
		$objWriter->startElement('a:cs');
		$objWriter->writeAttribute('typeface', '');
		$objWriter->endElement();

		foreach ($fontSet as $fontScript => $typeface)
		{
			$objWriter->startElement('a:font');
			$objWriter->writeAttribute('script', $fontScript);
			$objWriter->writeAttribute('typeface', $typeface);
			$objWriter->endElement();
		}

	}

	/**
	 * Write colour scheme to XML format
	 *
	 * @param    PHPExcel_Shared_XMLWriter $objWriter
	 *
	 * @return    string                        XML Output
	 * @throws    PHPExcel_Writer_Exception
	 */
	private function _writeColourScheme($objWriter) {
		foreach (self::$_colourScheme as $colourName => $colourValue)
		{
			$objWriter->startElement('a:' . $colourName);

			$objWriter->startElement('a:srgbClr');
			$objWriter->writeAttribute('val', $colourValue);
			$objWriter->endElement();

			$objWriter->endElement();
		}

	}
}
